(Just as an aside, and I know I've mentioned this on one of the episodes of the history podcast, but whoever decided to change the name of the game in Australia from "soccer" to "football" has made the work of Australian soccer historians and researchers infinitely more difficult).
Most of the jersey uploader's jerseys seem to be of a comparatively recent vintage - think mid-1990s onwards - and that'd be no surprise, as they're by far the easiest ones to get. I mean, good luck prising a Marathon Foods era jersey out of someone's cold, dead hands.
And as for a Montague Smash Repairs jersey (supposedly the thinking man's South Melbourne Hellas top) or anything before that, forget about it. That stuff is gone, and probably the only people who have those things have them locked in a vault, or have no clue of their value or importance of such an item, even as it's right in front of their face as I'm saying this, waggling back and forth, perhaps being help up by a loved one.
Nevertheless there are some rare gems in our collector friend's collection, such as this training kit, and this General Diagnostic Laboratories kit before the company's botched pap smear tests saw the firm re-brand as GDL, and the kits changed accordingly. At any rate, the whole affair has prompted me to dig out this photo of what I assume is Ange Postecoglou's training kit jersey from the late 1990s, which I found when I was cleaning out the old social club many, many years ago now. Strange what survives and what doesn't.